diff --git a/pr/sol/GNUmakefile b/pr/sol/GNUmakefile
index 2b352b3..3f65abe 100644
--- a/pr/sol/GNUmakefile
+++ b/pr/sol/GNUmakefile
@@ -46,7 +46,7 @@ sol-im-leerraum.ppm: sol-im-leerraum.pov sol.pov sz.pov mittelstueck.pov \
 	$(POVRAY) +L$(POVINC) +V -I$< +FP
 
 sol-ortho.ppm: sol-ortho.pov sol.pov sz.pov mittelstueck.pov \
-    ynkelonium_texture.pov Triebwerk.pov
+    ynkelonium_texture.pov Triebwerk.pov ringwulst.pov
 
 
 %.gif: %.ppm
diff --git a/pr/sol/ringwulst.pov b/pr/sol/ringwulst.pov
index 032c9b2..70a1d09 100644
--- a/pr/sol/ringwulst.pov
+++ b/pr/sol/ringwulst.pov
@@ -141,8 +141,13 @@
 	#if (Ringwulst_Triebwerk_An)
 	    #local i = 0;
 	    #while (i < 360) 
-		cylinder {
-		    <0, 0, 0> <1, 0, 0> 1
+		intersection {
+		    cylinder {
+			<0, 0, 0> <1, 0, 0> 1
+		    }
+		    sphere {
+			<0, 0, 0>, 1
+		    }
 		    hollow on
 		    pigment { rgbt 1.0 }
 		    interior {
@@ -158,7 +163,7 @@
 			    }
 			}
 		    }
-		    scale <250, 60, 60>
+		    scale <500, 60, 60>
 		    translate <350, 0, 0>
 		    rotate <0, 0, Ringwulst_Triebwerk_An>
 		    translate <R1, 0, 0>
diff --git a/pr/sol/sol-ortho.pov b/pr/sol/sol-ortho.pov
index 3eb6d38..e27f911 100644
--- a/pr/sol/sol-ortho.pov
+++ b/pr/sol/sol-ortho.pov
@@ -7,13 +7,15 @@
 #include "metals.inc"
 #include "stones.inc"
 
+#declare Ringwulst_Triebwerk_An = -45;
+
 global_settings {
         assumed_gamma 1.0
-        //ambient_light rgb<0.5, 0.5, 0.5>
+        ambient_light rgb<0.0, 0.0, 0.0>
 }
 
 light_source {
-    <-2000, 2000, -2000>
+    <20000, -20000, -20000>
     color White
 }
 camera {